52646464 divided by 644 
Let's see how many times 644 fits into 52646464.

Moving on to step 1:
If we divide 5 by 644, we get 0 and a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 644

Step 2:
52 divided by 644 is 0 with a remainder of 52.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 52 leaves us with 52.
Include the next digit (6) from the dividend after 52, then repeat: 526 / 644

On to step 3:
When dividing 526 by 644, we get 0 with a remainder of 526.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 526 and we're left with 526.
Grab the next digit (4) from the dividend, add it to 526, then carry on: 5264 / 644

Step 4:
5264 divided by 644 is 8 with a remainder of 112.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 5152 from 5264 and we're left with 112.
Take the next digit (6) from the dividend and append it to 112, then repeat: 1126 / 644

Going ahead to step 5:
644 can be fit into 1126 1 times, resulting in a remainder of 482.
Put 1 as the next digit of the answer. 
Result so far: 81.0
Subtract 644 from 1126 to get 482.
Include the next digit (4) from the dividend after 482, then repeat: 4824 / 644

On to step 6:
When dividing 4824 by 644, we get 7 with a remainder of 316.
The next digit of our result is 7. 
Result so far: 817.0
If we take 4508 away from 4824, we end up with 316.
Include the next digit (6) from the dividend after 316, then repeat: 3166 / 644

Let's proceed to step 7:
644 goes into 3166 4 times with a remainder of 590.
The next digit of our result is 4. 
Result so far: 8174.0
Subtract 2576 from 3166 to get 590.
Include the next digit (4) from the dividend after 590, then repeat: 5904 / 644

Moving on to step 8:
644 can be fit into 5904 9 times, resulting in a remainder of 108.
The next digit of our result is 9. 
Result so far: 81749.0
The remainder is 108 after subtracting 5796 from 5904.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Moving on to step 9:
The number 644 fits into 1080 1 times, leaving a remainder of 436.
Write down 1 as next digit of the result. 
Result so far: 81749.1
Deduct 644 from 1080 and we're left with 436.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Step 10:
The number 644 fits into 4360 6 times, leaving a remainder of 496.
Write down 6 as next digit of the result. 
Result so far: 81749.16
Deduct 3864 from 4360 and we're left with 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Advancing to step 11:
644 can be fit into 4960 7 times, resulting in a remainder of 452.
Use 7 as the next digit of our solution. 
Result so far: 81749.167
Subtract 4508 from 4960 to get 452.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4520, and continue the process.

Step 12:
4520 divided by 644 is 7 with a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 81749.1677
Subtract 4508 from 4520 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 81749.1677, with a leftover of 0.00012.